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Check your start times, and station run times. Sounds like you may have different start times or multiple programs running. Check if you have more than 1 program, such as A, B, or C. Check to make sure you only have one start time.

I have a Nelson controller installed in 1999. Last year it was running during the day, in addition to the program I had it set for at night. Can you tell me if I set it to program B, does it run both A and B? If C, then all three? If this is the case, is it designed to set the front yard on program A and the back yard on program B, so you don't have to run your sprinklers for 4 hours in a row?